Hi all,
I was wondering if anyone knew a good/safe way to update a single column in a table that could contain upto 8 million rows...
simple command like:
UPDATE set blah=foo where bar=XXX;
I will be running this on tables being written to and tables that have already been created.
... (3 Replies)
Hello.
I'm not sure how I can get around this, or what I am doing wrong, but I need some help. :)
I want to do an select query looking like this:
SELECT venue, SUM( amount )
FROM IWD
WHERE venue = 'Foxy Hollow'
Unfortunately I need to have spaces in the names in these fields,
is... (10 Replies)
Hi All,
I need to update 2 rows in my file. But i can do only one row update by sed command. Please help me how can i change mutltiple rows in single sed commana
my i/p file: (example.txt)
record
integer (10) present_id;
string (10) first_name;
string (10) last_name;
string... (2 Replies)
Hello,
Met a problem when I tried to insert rows to MySQL database from an old book that fits my learning level (MySQL and Perl for the Web, by Paul DuBois, 2001). First, under mysql console I created a database: webdb and the table: todo. Then I draft the perl-cgi script to have online page.... (0 Replies)
I feel stupid for asking this because it seems that MYSQL code isn't working the way that I think it should work.
Basically I wrote code like this:
select * from `Test_DC_Trailer` HAVING max(DR_RefKey);
Where the DR_RefKey is a unique numeric field that is auto iterated (like a primary key)... (7 Replies)
Hi, i want to create a table automatically based on another table (sms_key).
For example;
If user create a new row with sms_keyword field: IRC then a table created automatically (with some field on it, like: name, ph_number, messages).
select * from sms_key;
+-------------+
|... (1 Reply)
Dear community,
I have to split string in table and list all values. I'll skip the code and jump directly to mysql query.
This is the table:
category title
======= =======
7,3 title 1
1,3 title 2
1,2,3 title 3
Now, what I need is split category into single... (2 Replies)
Right I have a MYSQL database with table1 with 3 columns, colA, colB and colC. I want to combine the data in the 3 columns into a 4th column names col_comb. Here's the SQL command that works:
UPDATE table1 SET `col_comb` = CONCAT( `colA` , ' - ', `colB` , ', ', `colC` );
So now I want this... (5 Replies)
Discussion started by: barrydocks
5 Replies
LEARN ABOUT REDHAT
create_view
CREATE VIEW(7) SQL Commands CREATE VIEW(7)NAME
CREATE VIEW - define a new view
SYNOPSIS
CREATE [ OR REPLACE ] VIEW view [ ( column name list ) ] AS SELECT query
INPUTS
view The name (optionally schema-qualified) of a view to be created.
column name list
An optional list of names to be used for columns of the view. If given, these names override the column names that would be deduced
from the SQL query.
query An SQL query (that is, a SELECT statement) which will provide the columns and rows of the view.
Refer to SELECT [select(7)] for more information about valid arguments.
OUTPUTS
CREATE VIEW
The message returned if the view is successfully created.
ERROR: Relation 'view' already exists
This error occurs if the view specified already exists in the database.
WARNING: Attribute 'column' has an unknown type
The view will be created having a column with an unknown type if you do not specify it. For example, the following command gives a
warning:
CREATE VIEW vista AS SELECT 'Hello World'
whereas this command does not:
CREATE VIEW vista AS SELECT text 'Hello World'
DESCRIPTION
CREATE VIEW defines a view of a query. The view is not physically materialized. Instead, a query rewrite rule (an ON SELECT rule) is auto-
matically generated to support SELECT operations on views.
CREATE OR REPLACE VIEW is similar, but if a view of the same name already exists, it is replaced. You can only replace a view with a new
query that generates the identical set of columns (i.e., same column names and data types).
If a schema name is given (for example, CREATE VIEW myschema.myview ...) then the view is created in the specified schema. Otherwise it is
created in the current schema (the one at the front of the search path; see CURRENT_SCHEMA()). The view name must be distinct from the
name of any other view, table, sequence, or index in the same schema.
NOTES
Currently, views are read only: the system will not allow an insert, update, or delete on a view. You can get the effect of an updatable
view by creating rules that rewrite inserts, etc. on the view into appropriate actions on other tables. For more information see CREATE
RULE [create_rule(7)].
Use the DROP VIEW statement to drop views.
USAGE
Create a view consisting of all Comedy films:
CREATE VIEW kinds AS
SELECT *
FROM films
WHERE kind = 'Comedy';
SELECT * FROM kinds;
code | title | did | date_prod | kind | len
-------+---------------------------+-----+------------+--------+-------
UA502 | Bananas | 105 | 1971-07-13 | Comedy | 01:22
C_701 | There's a Girl in my Soup | 107 | 1970-06-11 | Comedy | 01:36
(2 rows)
COMPATIBILITY
SQL92
SQL92 specifies some additional capabilities for the CREATE VIEW statement:
CREATE VIEW view [ column [, ...] ]
AS SELECT expression [ AS colname ] [, ...]
FROM table [ WHERE condition ]
[ WITH [ CASCADE | LOCAL ] CHECK OPTION ]
The optional clauses for the full SQL92 command are:
CHECK OPTION
This option is to do with updatable views. All INSERT and UPDATE commands on the view will be checked to ensure data satisfy the
view-defining condition. If they do not, the update will be rejected.
LOCAL Check for integrity on this view.
CASCADE
Check for integrity on this view and on any dependent view. CASCADE is assumed if neither CASCADE nor LOCAL is specified.
CREATE OR REPLACE VIEW is a PostgreSQL language extension.
SQL - Language Statements 2002-11-22 CREATE VIEW(7)